The Straw Hats encounter a city in the middle of a whirlpool, called the Ocean's Navel, that is being destroyed by giant monsters. These monsters supposedly protect a treasure capable of granting wishes, but in the process of defeating these guardians, the crew ends up releasing another evil. (aired after Episode 53)
(Source: Wikipedia)
More Seasons
Special 1: Adventure in the Ocean's Navel
Special 2: A Father's Huge, HUGE Dream!
Special 3: Protect! The Last Great Performance
Special 4: The Detective Memoirs of Chief Straw Hat Luffy
Special 5: Episode of Nami
Special 6: Episode of Luffy - Hand Island Adventure
Special 7: Episode of Merry - The Tale of One More Friend
Special 8: 3D2Y: 15th Anniversary
Special 9: Episode of Sabo - The Three Brothers' Bond
Special 10: Adventure of Nebulandia
Special 11: Heart of Gold
Special 12: Episode of East Blue
Special 13: Episode of Skypiea
Special 14: Barto's Secret Room
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